Ecler HMA120 User Manual

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Contents

Ecler HMA120 User Manual Manual pdf 8 page image

87. POWERING AND OPERATING7.1. Switching on the unitThis is done directly by using the ON/OFF switch (26) on the back panel, lighting up the front ONLED indicator (1). In a complete audio installation, it is important to start up the equipment in the followingsequence: sound sources, mixer, equalizers, active filters and finally power amplifiers. To turn them offthe sequence should follow an inverse pattern.7.2. Gain adjustments, levels and indicatorsAdjust the input gain level for each signal using its ADJ control on the rear panel (34, 36: MIC1 andMIC2/LINE inputs).Then, adjust the relative mix volume of the input channels using their respective level controls onthe front panel (18, 21, 24). The SIGNAL indicator (2) begins to light up when signals are sufficientlypresent to be audible, lighting up with greater intensity when the level increases. The CLIP indicator (3) willbegin to light up when the mix level is so high that it comes close to the clipping threshold of the unit.It is normal that when operating at high output power, the CLIP indicators light up in rhythm withthe low frequencies, which carry the most energy. Make sure that these indicators do not remainpermanently lit.Additionally, you can activate the Noise Gate and/or Talkover functions for the MIC1 andMIC2/LINE inputs, via the switches on the left side of the unit. Refer to section 4.1 MIC1, MIC2/LINEInputs for more details.7.3. EqualisationThe tone controls for the different inputs (19, 20, 22, 23) provide a gain/attenuation of ±10dB foreach of the following bands: BASS: 100Hz ± 10dB TREBLE: 6kHz ± 10dBGiven the philosophy of use of the product, it has a tone control system that requires a screwdriveradjustment, thus preventing operating mistakes during its daily use.7.4. Auto Stand-by FunctionYou can enable the automatic switching to low power mode using the dedicated switch located onthe left side of the unit. When activated, the HMA120 enters the low power mode after detecting theabsence of audio signals at the inputs for a period of 2 minutes or more, returning back to normal operatingmode upon detecting a valid input signal.7.5. Ground loops, background noiseYou must always avoid interconnected grounds between signal sources. It means grounds mustnever arrive by two or more different ways, since this could produce "hum" ("ground loop") that wouldeven interfere with the sound reproduction quality.Cable shielding, when connected to the chassis, must never be interconnected, so as to avoidground loops.